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Well Isolation Tool

Circulating tool for annular isolation during displacement

The well isolation tool enables the operator to isolate the wellbore (below the tool's circulating ports) from hydrostatic and induced pressures and still circulate at increased rates. This is often done to control fluid loss to open perforations or an openhole interval below the tool.

Applications

With the well isolation tool, high circulation rates can be used to displace the upper part of a well without applying pressure to the lower part. It is most effective where there is no set-down point, such as a liner top for conventional weight-activated circulating tools. It is ideal where fluid loss to perforations or openhole sections would be expected below the tool, and it can be run above pressure-sensitive equipment such a fluid isolation valves.

Features

Ball-drop activation and deactivation

Two internal ball seats that move to activate and deactivate the tool

Balls retained on seats in tool

Stabilizer and stabilizer-mill profiles to ensure there are no casing restrictions and to protect the diverter cup from possible damage

Availability in 7-, 9 5/8-, or 10 3/4-in sizes

No limit on rotation speed while circulating

Advantages

Boosts annular velocity while protecting the formation and open perforations from excessive surge and equivalent circulating density (ECD) pressures

Prevents surging or swabbing the well during trips with built-in bypass channel around the annular-isolation diverter cup